Central Board Of Secondary Education [CBSE] — Lesser Marks in 12th std 2021

Respected sir/madam most humbly and respectfully I beg to say that I am very unsatisfied with my marks given by my school (CBSE ) in class 12 in academic session July 2021
some of my classmates who were all scoring lesser or similar tome in class 11 and 12 were given 85-90 % . Whereas I was given only 78.8% School has showed extreme partiality and given more marks for their old students and given less marks for students who joined in +1 from different schools. This perfectly shows department have done discrimination among students. Those who do not deserve even 80% have got 90% and above and those who deserve have got very low percentage of 70-85%.
As class 12 percentage matters a lot for us for our better future therefore I solemnly request you to do justice for the students who deserve good percentage yet they haven't got that.
I will be very grateful to you for the same.